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While CSS animation is interesting enough for little graphical accents (snow animation and subtle things like that), indeed functional feedback should probably be restricted to JavaScript.

As for the examples, they run way too slow on my machine to have any kind of effect. Even in Safari (4 – Windows) I see a black square being rotated before the animation starts to make any sense. The fallback (graceful degradation) in FF is just horrible (a big black square —- yeah, that makes sense).

CSS animation are not the next best thing. They are nice additions for the future, yet looking at the current state of css coding today there’s still a world of work to do. Standardization, best practices in coding, figuring out the new selectors. If you’re looking to improve the way you write css, there’s plenty of things to work on.